z/OS Version 2 Release 1 Technical Updates

Virtual lookaside facility

This chapter describes the enhancements, functions, and features of the virtual lookaside facility (VLF) that are introduced with z/OS Version 2 Release 1 (2.1). It includes the following sections:

•3.1, “MODIFY VLF command” on page 32

•3.2, “VLF PARMLIB concatenation” on page 32

•3.3, “The VLF Health Check” on page 33

•3.4, “Documentation and reference” on page 34

The VLF is a set of IBM MVS services that provide a high-performance, alternative path of retrieving named objects from DASD for many users. VLF uses data ...